Check out TPI 750W 40" Architectural Baseboard Heater w/ Steel element for longer life. Model no E3707040B is constructed using powder-coated 12-gauge heavy duty extruded Aluminum with junction boxes located on each end of the unit. This unit is a permanent mount unit. Heating elements are immersed in a heat transferring liquid enclosed by a copper tube casing for better heating efficiency. An automatic thermal linear limit is used along the entire heated length of the unit to limit the heating of the casing of the product. Wire guard extends along the entire outlet area of the baseboard.